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Ringdorfer M.,Magna Powertrain AG and Co KG | Horn M.,Alpen Adria Universtitat Klagenfurt
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2013

The paper introduces a novel vehicle dynamics control concept based on a hybrid actuator system consisting of friction brake and traction machine. This configuration offers new degrees of freedom in the control of electric vehicles. The proposed approach is based on a cascaded control structure with an inner yaw rate loop and an outer sideslip angle feedback loop. The use of sliding mode algorithms accounts for plant uncertainties and reduces the effort for controller tuning to a minimum without neglecting the aspect of energy efficiency. With the help of selected driving maneuvers it is shown that the performance of a car equipped with the advanced stability control system is superior to a car with conventional electronic stability algorithms. Source


Paar C.,Magna Powertrain AG and Co KG | Paar C.,University of Graz | Muetze A.,University of Graz | Kolbe H.,University of Graz
IEEE Transactions on Industry Applications | Year: 2015

This paper describes a method for fast identification of the thermal behavior of vehicle integrated electric drives to propose a better understanding of electric machine design tailored to driving cycles. A simple, but satisfactorily accurate, calculation method for the estimation of machine losses, which is an input for the analytic thermal network, in the early design stage is introduced. The analytic models, which are verified using measurement data, are used for parameter and case studies for consideration of the thermal environment, with a focus on the gearbox. The first case study analyzes the influence of the gearbox on the thermal behavior of critical machine components. Aiming to use the gearbox lubricant for cooling the winding heads, an improvement of machine performance using an alternative cooling approach, which cools down the end windings, is shown in the second case study. © 1972-2012 IEEE. Source


Vengudusamy B.,Ac2t Research Gmbh | Grafl A.,Ac2t Research Gmbh | Novotny-Farkas F.,OMV Austria Exploration and Production GmbH | Schofmann W.,Magna Powertrain AG and Co KG
Lubrication Science | Year: 2014

The friction behaviour of five different gear oils in rolling-sliding and pure sliding contacts and how temperature influences their friction properties were investigated. It is found that increasing temperature decreases boundary frictionwith gear oils that contain frictionmodifierswhile not for other gear oils, at all contact pressures investigated. In mixed lubrication region, temperature decreases friction at low contact pressures while increases friction at high contact pressures. The effect of slide-roll ratio on friction is significant in boundary lubrication region especially at higher temperature while less significant in mixed lubrication region at both low and high temperatures. The ranking of gear oils for friction in boundary and mixed lubrication regimes is similar both in rolling-sliding and pure sliding contacts, regardless of temperature. © 2013 John Wiley & Sons, Ltd. Source


Paar C.,Magna Powertrain AG and Co KG | Kolbe H.,Graz University of Technology | Muetze A.,Graz University of Technology
2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014 | Year: 2014

We present a method for fast identification of the thermal behavior of vehicle integrated electric drives to propose a better understanding of electric machine design tailored to driving cycles. A simple, but satisfactorily accurate calculation method for the estimation of machine losses, which is an input for the analytic thermal network, in the early design stage is introduced. The analytic models, which are verified using measurement data, are used for parameter and case studies for consideration of the thermal environment with focus on the gearbox. An improvement of machine performance using an alternative cooling approach which cools down the end windings is shown in the final section of the paper. © 2014 IEEE. Source


Ringdorfer M.,Klagenfurt University | Ringdorfer M.,Magna Powertrain AG and Co KG | Horn M.,Klagenfurt University
Proceedings of the IEEE International Conference on Control Applications | Year: 2011

A new vehicle stability control approach for electric vehicles is introduced. The proposed wheel slip controller extends the functionality of state-of-the-art electric vehicle operation strategies and closes the gap to driver assistance systems and conventional vehicle dynamics control systems. Maximum energy efficiency and driving safety can be guaranteed by coordinated control of the electrical propulsion system and the mechanical braking system. During safe vehicle operation, the controller monitors the vehicle operation unit and in case of a blocking or spinning wheel, it assures anti blocking and anti slip functionalities by coordinating mechanical brake interventions and single wheel traction motor control. The proposed controller structure is outlined and first simulation results are presented. © 2011 IEEE. Source

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